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Message-ID: <45DED828.6070202@hitachi.com>
Date: Fri, 23 Feb 2007 21:03:52 +0900
From: Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com>
To: linux-kernel@...r.kernel.org
Cc: akpm@...ux-foundation.org, miklos@...redi.hu,
yumiko.sugita.yf@...achi.com, masami.hiramatsu.pt@...achi.com,
hidehiro.kawai.ez@...achi.com, yuji.kakutani.uw@...achi.com,
soshima@...hat.com, haoki@...hat.com
Subject: [RFC][PATCH 1/3] VM throttling: Add vm.dirty_limit_ratio to sysctl
This patch adds sysctl variable vm.dirty_limit_ratio.
Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com>
Signed-off-by: Yuji Kakutani <yuji.kakutani.uw@...achi.com>
---
include/linux/sysctl.h | 1 +
include/linux/writeback.h | 1 +
kernel/sysctl.c | 11 +++++++++++
mm/page-writeback.c | 5 +++++
4 files changed, 18 insertions(+)
Index: linux-2.6.20-mm2-bdp/include/linux/sysctl.h
===================================================================
--- linux-2.6.20-mm2-bdp.orig/include/linux/sysctl.h
+++ linux-2.6.20-mm2-bdp/include/linux/sysctl.h
@@ -207,6 +207,7 @@ enum
VM_PANIC_ON_OOM=33, /* panic at out-of-memory */
VM_VDSO_ENABLED=34, /* map VDSO into new processes? */
VM_MIN_SLAB=35, /* Percent pages ignored by zone reclaim */
+ VM_DIRTY_LIMIT_RATIO=36,/* dirty_limit_ratio */
/* s390 vm cmm sysctls */
VM_CMM_PAGES=1111,
Index: linux-2.6.20-mm2-bdp/include/linux/writeback.h
===================================================================
--- linux-2.6.20-mm2-bdp.orig/include/linux/writeback.h
+++ linux-2.6.20-mm2-bdp/include/linux/writeback.h
@@ -95,6 +95,7 @@ static inline int laptop_spinned_down(vo
/* These are exported to sysctl. */
extern int dirty_background_ratio;
extern int vm_dirty_ratio;
+extern int dirty_limit_ratio;
extern int dirty_writeback_interval;
extern int dirty_expire_interval;
extern int block_dump;
Index: linux-2.6.20-mm2-bdp/kernel/sysctl.c
===================================================================
--- linux-2.6.20-mm2-bdp.orig/kernel/sysctl.c
+++ linux-2.6.20-mm2-bdp/kernel/sysctl.c
@@ -684,6 +684,17 @@ static ctl_table vm_table[] = {
.extra2 = &one_hundred,
},
{
+ .ctl_name = VM_DIRTY_LIMIT_RATIO,
+ .procname = "dirty_limit_ratio",
+ .data = &dirty_limit_ratio,
+ .maxlen = sizeof(dirty_limit_ratio),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &zero,
+ .extra2 = &one_hundred,
+ },
+ {
.ctl_name = VM_DIRTY_WB_CS,
.procname = "dirty_writeback_centisecs",
.data = &dirty_writeback_interval,
Index: linux-2.6.20-mm2-bdp/mm/page-writeback.c
===================================================================
--- linux-2.6.20-mm2-bdp.orig/mm/page-writeback.c
+++ linux-2.6.20-mm2-bdp/mm/page-writeback.c
@@ -75,6 +75,11 @@ int dirty_background_ratio = 10;
int vm_dirty_ratio = 40;
/*
+ * The generator of dirty data is blocked at this percentage
+ */
+int dirty_limit_ratio = 45;
+
+/*
* The interval between `kupdate'-style writebacks, in jiffies
*/
int dirty_writeback_interval = 5 * HZ;
-
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